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Finding the Fourth Proportional to 439.96, 607.20 and 274.36

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Solution

The fourth proportional to 439.96, 607.20 and 274.36 is: 378.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.96 : 607.20 = 274.36 : x
  2. Step 2: Convert to fraction form
    439.96/607.20 = 274.36/x
  3. Step 3: Cross multiply
    439.96x = 607.20 × 274.36
  4. Step 4: Simplify right side
    439.96x = 166,591.39
  5. Step 5: Solve for x
    x = 166,591.39/439.96
  6. Step 6: Final answer
    x = 378.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.